The men's 4 × 400 metres relay event at the 2003 Pan American Games was held on August 9.
Results
| Rank | Heat | Nation | Athletes | Time | Notes |
|---|---|---|---|---|---|
 | 2 |  Jamaica | Michael Campbell, Sanjay Ayre, Lanceford Spence, Davian Clarke | 3:01.81 | |
 | 2 |  United States | Mitch Potter, Ja'Warren Hooker, Adam Steele, James Davis | 3:01.87 | |
 | 2 |  Dominican Republic | Arismendy Peguero, Carlos Santa, Julio Vidal, Félix Sánchez | 3:02.02 | NR |
| 4 | 2 |  Trinidad and Tobago | Jacey Harper, Sherridan Kirk, Jamil James, Damion Barry | 3:05.28 | |
| 5 | 2 |  Bahamas | Andrae Williams, Dennis Darling, Timothy Munnings, Nathaniel McKinney | 3:05.50 | |
| 6 | 2 |  Cuba | Glauder Garzón, Sergio Hierrezuelo, Alianni Hechevarría, Yeimer López | 3:06.27 | |
| 7 | 2 |  Venezuela | Jonathan Palma, Simoncito Silvera, Luis Luna, William Hernández | 3:06.52 | |
| 8 | 1 |  Grenada | Bruce Swan, Sheldon Noel, Shane Charles, Alleyne Francique | 3:09.50 | |
| 9 | 1 |  Ecuador | Cristian Gutiérrez, Andrés Gallegos, Luis Morán, Cristian Matute | 3:21.42 | |
| 1 |  Belize | DNS |
References
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